iOS 12.1.2 (build 16D5024a) is an official Apple over-the-air update for the iPhone XS Max, released on 2018-12-10T18:09:07Z. The update package is 319.53 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 89926468801877b7237d96e1eae1ef3e14940a53.zip.